10 lines
637 B
Text
10 lines
637 B
Text
flex is a tool for generating scanners: programs which recognized
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lexical patterns in text. flex reads the given input files, or its
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standard input if no file names are given, for a description of a
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scanner to generate. The description is in the form of pairs of
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regular expressions and C code, called rules. flex generates as
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output a C source file, lex.yy.c, which defines a routine yylex().
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This file is compiled and linked with the -lfl library to produce an
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executable. When the executable is run, it analyzes its input for
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occurrences of the regular expressions. Whenever it finds one, it
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executes the corresponding C code.
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